Well I've only tried Flames final 1.04 mod (
www.flamestryke.com) which is very good.
It adds a lot of race and class specific items that weren't there before, and adds lots of graphical differences to objects that all had the same graphic before.
Its fun but the game seems heavily weighted against you at the start, and in your favour later on, although that may have nothing to do with the mod at all.